Choke tube



FIG. 1 is a front elevational view of a choke tube showing my new ornamental design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a cross-sectional view taken along line 5--5 of FIG. 1; and,

FIG. 6 is a longitudinal sectional view taken along line 6--6 of FIG. 1. 

The ornamental design for a choke tube, as shown and described. 